Question
A car covers the first 120 km at a speed of 60 km/h and
the next 180 km at a speed of 90 km/h. What is the average speed of the car for the whole journey?Solution
Total distance = 120 + 180 = 300 km Time for first 120 km = 120 / 60 = 2 hours Time for next 180 km = 180 / 90 = 2 hours Total time = 4 hours Average speed = Total distance / Total time = 300 / 4 = 75 km/h
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